protected override void Encode(IChannelHandlerContext context, byte[] message, IByteBuffer output)
{
if (message.Length % 16 != 0)
{
throw new InvalidOperationException($"Frame length should be a multiple of 16");
}
if (_logger.IsTrace)
{
_logger.Trace($"Sending frame (before encryption): {message.ToHexString()}");
}
_frameCipher.Encrypt(message, 0, 16, message, 0);
_frameMacProcessor.AddMac(message, 0, 16, true);
_frameCipher.Encrypt(message, 32, message.Length - 48, message, 32);
_frameMacProcessor.AddMac(message, 32, message.Length - 48, false);
if (_logger.IsTrace)
{
_logger.Trace($"Sending frame (after encryption): {message.ToHexString()}");
}
output.WriteBytes(message);
}
private void WriteHeaderMac(IByteBuffer output)
{
_frameMacProcessor.AddMac(_encryptBuffer, 0, 16, _macBuffer, 0, true);
output.WriteBytes(_macBuffer);
}